Imaging apparatus and imaging method

Abstract

An imaging apparatus includes: an imaging section receiving color light and interpolation light including at least a part of a wavelength range of the color light in order to interpolate the brightness of the color light and converting the received color light and interpolation light into a signal; a control section controlling a first exposure time of the color light and a second exposure time of the interpolation light separately according to the brightness of an object to be imaged; and an image creating section creating an image on the basis of a color signal, which is output when the imaging section receives the color light, during the first exposure time controlled by the control section and on the basis of an interpolation signal, which is output when the imaging section receives the interpolation light, during the second exposure time controlled by the control section.

1. An imaging apparatus comprising:
 an imaging section having at least one pixel which receives color light and interpolation light including at least a part of a wavelength range of the color light in order to interpolate the brightness of the color light and which converts each of the received color light and interpolation light into a signal; 
 a control section which controls a first exposure time of the color light and a second exposure time of the interpolation light at the at least one pixel separately according to the brightness of an object to be imaged, which is to be imaged by the imaging section; and 
 an image creating section which creates an image on the basis of a color signal, which is output at the at least one pixel when the at least one pixel of the imaging section receives the color light, during the first exposure time controlled by the control section and on the basis of an interpolation signal, which is output at the at least one pixel when the at least one pixel of the imaging section receives the interpolation light, during the second exposure time controlled by the control section. 
 
     
     
       2. The imaging apparatus according to  claim 1 , further comprising:
 an acquisition section which acquires the luminance of the object to be imaged; and 
 a comparison section which compares the luminance acquired by the acquisition section with a defined value, 
 wherein when a comparison result of the comparison section indicates that the luminance is lower than the defined value, the control section controls the first exposure time and the second exposure time separately such that the second exposure time of the interpolation light is longer than the first exposure time of the color light. 
 
     
     
       3. The imaging apparatus according to  claim 2 ,
 wherein the color light includes first color light having a first wavelength range, second color light having a second wavelength range, and third color light having a third wavelength range, 
 a filter section including a first filter which transmits the first color light, a second filter which transmits the second color light, a third filter which transmits the third color light, and an interpolation filter which transmits the interpolation light is provided, and 
 the control section makes light incident on the first to third filters during the first exposure time and incident on the interpolation filter during the second exposure time so that the imaging section receives the first color light, the second color light, the third color light, and the interpolation light selectively according to the comparison result of the comparison section. 
 
     
     
       4. The imaging apparatus according to  claim 2 ,
 wherein the color light includes first color light having a first wavelength range, second color light having a second wavelength range, and third color light having a third wavelength range, 
 a light-emitting section capable of selectively emitting the first color light, the second color light, the third color light, and the interpolation light is provided, and 
 the control section makes the light-emitting section emit the first to third color light during the first exposure time and emit the interpolation light during the second exposure time so that the imaging section receives the first color light, the second color light, the third color light, and the interpolation light selectively according to the comparison result of the comparison section. 
 
     
     
       5. The imaging apparatus according to  claim 1  or  2 , further comprising:
 an acquisition section which acquires the luminance of the object to be imaged; and 
 a comparison section which compares the luminance acquired by the acquisition section with a defined value, 
 wherein when a difference between the luminance and the defined value falls within an allowable range, the control section controls the first exposure time and the second exposure time separately such that the first exposure time of the color light and the second exposure time of the interpolation light are equal. 
 
     
     
       6. The imaging apparatus according to  claim 1 , further comprising:
 an acquisition section which acquires the luminance of the object to be imaged; and 
 a comparison section which compares the luminance acquired by the acquisition section with a defined value, 
 wherein when a comparison result of the comparison section indicates that the luminance is higher than the defined value, the control section controls the first exposure time and the second exposure time separately such that at least the second exposure time of the interpolation light is shorter than the first exposure time of the color light. 
 
     
     
       7. The imaging apparatus according to  claim 1 ,
 wherein the color light includes first color light having a first wavelength range, second color light having a second wavelength range, and third color light having a third wavelength range, and 
 the control section controls the first exposure time of the color light such that exposure time of the first color light, exposure time of the second color light, and exposure time of the third color light are equal. 
 
     
     
       8. The imaging apparatus according to  claim 1 ,
 wherein the image creating section acquires a correction value, which is expressed by a ratio of a sum of a value of the color signal and a value of the interpolation signal to the value of the color signal, and corrects the color signal, which is output when the imaging section receives the color light, with the correction value. 
 
     
     
       9. An imaging method comprising the steps of:
 controlling a first exposure time of color light and a second exposure time of interpolation light, which includes at least a part of a wavelength range of the color light in order to interpolate the brightness of the color light, at at least one pixel separately according to the brightness of an object to be imaged; 
 receiving the color light and the interpolation light at the at least one pixel and converting each of the received color light and interpolation light into a signal under the control; and 
 creating an image on the basis of a color signal, which is output at the at least one pixel when the color light is received at the at least one pixel, during the first exposure time under the control and on the basis of an interpolation signal, which is output at the at least one pixel when the interpolation light is received the at least one pixel, during the second exposure time under the control.